Chemical composition
Carbon (C) : 0.15 or less

Silicon (Si) : 1.00 or less

(Mn) Manganese :5.5 ~ 7.50

(Cr) Chromium: 16.0-18.0

Nitrogen (N) : 0.25 or less

Phosphorus (P) : 0.060 or less

Sulfur (S) : 0.030 or less

Nickel (Ni) : 3.5 to 5.5
Physical properties of
Tensile strength :520MPa

Yield strength :275MPa

Elongation :55 to 60%

Elastic modulus :29,000,000 psi converted into: 203000MPa

Hardness requirements (Brinell hardness) HRB< 183 n/was (MPa).

Density :.280lbs/cubic inch(7.93g/cm3)
201 has high manganese content, very bright surface with dark light, high manganese content easy to rust. 304 stainless steel contains more chromium, the surface is matte, no rust. Put the two together and you have a comparison. The most important thing is the difference in corrosion resistance. The corrosion resistance of 201 is very poor, so the price is much cheaper. And because 201 contains low nickel, so the price is lower than 304 stainless steel, so the corrosion resistance is not as good as 304 stainless steel.